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Warm-Up February 14, 2013

Warm-Up February 14, 2013. Write down the date and objective. Objective: SWBAT determine the half-life of a substance by completing the Half-Life of a Twizzler activity. Complete the following warm-up: What is radioactive decay? What is the difference between beta and alpha decay? .

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Warm-Up February 14, 2013

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  1. Warm-UpFebruary 14, 2013 • Write down the date and objective. • Objective: SWBAT determine the half-life of a substance by completing the Half-Life of a Twizzler activity. • Complete the following warm-up: • What is radioactive decay? • What is the difference between beta and alpha decay?

  2. Objective & Agenda • SWBAT determine the half-life of a substance by completing the Half-Life of a Twizzler activity. Agenda • Radioactivity • Twizzler Lab • Half-life • Practice Problems • Review • Exit Slip

  3. What is half-life? • Half-life is the time it takes for half of its atoms to decay into something else.

  4. Twizzler Lab • Read through the procedures. • Do not bite your Twizzler until given permission. • Make sure you only eat half at a time. • Answer the Conclusion & Analysis Questions

  5. Half-Life • The length of time it takes for one-half of the atoms of a radioactive nuclide to disintegrate.

  6. Half-Life

  7. Half-Life Example 1. Strontium-90 Has half-life of 28 years. If a 1.00-mg sample was stored for 112 years. What mass of Sr-90 would remain? 2. The half-life of isotope X is 2.0 years. How many years would it take for a 4.0 mg sample of X to decay and have only 0.50 mg of it remain?

  8. Half-Life Practice

  9. Pit Stop Review • When you finish a pit stop, shout “Pit Stop” • Everyone on your team must have that pit stop complete • I will check your work, if it is correct you can move on to the next Pit Stop • First team finishes, wins!

  10. Reminders • HW 11 Due tomorrow • Unit 2 Exam tomorrow • Honors- Reading Assignment due tomorrow

  11. Exit SlipFebruary 14, 2013 1. After 30 days, 5.0 grams of a radioactive isotope remains from an original 40 gram sample. What is the half-life of this element?

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